Police have sounded the alarm after more than 20 cars parked in villages were reportedly targeted in one night.
Vehicles in Aylesham Road, Snowdown and nearby in Woolage Green between Canterbury and Dover were interfered with in the early hours of Sunday.
It is reported that door handles were tried, property rummaged through and things removed.
Cash and personal items were thought to be stolen and some of what had been taken was later recovered nearby.
Following an investigation, officers arrested three fifteen-year-old boys today in connection with the reports.
They remain in custody pending further enquiries.
Now, officers are warning car owners to take measures to prevent their belongings being stolen.
A police spokesman said: “Drivers should make sure vehicles are locked, especially if you own a car where wing mirrors show whether it is locked.
“Ideally don't leave any valuables in vehicles when away from it, but make sure anything left inside is out of sight.
“Completely close all windows and your sun roof, even when it's hot, to stop thieves 'fishing' through windows.
“Park somewhere busy, visible to other members of the public, ideally covered by CCTV, and well-lit if leaving cars overnight.”
